Slenderness Error

Dear Sir,

                We are using Staad Pro Software of Select Series 5 while in computing Analysis and Design of Tie Beam using Staad it says fails in Slenderness. We are using ISMB200 as Tie it takes least radius of Gyration, Whereas  rx-8.2 cm, ry -2.11cm  span 6095 mm. If I changed the Main value and Tmain value to 350 but actual KLR as per staad is 288 fails. How to change the slenderness allowable value. We are Checking as per IS.

Thanks in Advance